首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   22494篇
  免费   404篇
  国内免费   1篇
财政金融   4353篇
工业经济   1583篇
计划管理   3641篇
经济学   5097篇
综合类   491篇
运输经济   78篇
旅游经济   255篇
贸易经济   3888篇
农业经济   854篇
经济概况   2555篇
信息产业经济   3篇
邮电经济   101篇
  2020年   183篇
  2019年   258篇
  2018年   939篇
  2017年   991篇
  2016年   690篇
  2015年   217篇
  2014年   384篇
  2013年   1659篇
  2012年   565篇
  2011年   1054篇
  2010年   914篇
  2009年   956篇
  2008年   872篇
  2007年   994篇
  2006年   390篇
  2005年   450篇
  2004年   467篇
  2003年   550篇
  2002年   402篇
  2001年   359篇
  2000年   401篇
  1999年   313篇
  1998年   332篇
  1997年   337篇
  1996年   338篇
  1995年   325篇
  1994年   322篇
  1993年   318篇
  1992年   348篇
  1991年   362篇
  1990年   294篇
  1989年   236篇
  1988年   249篇
  1987年   239篇
  1986年   276篇
  1985年   379篇
  1984年   363篇
  1983年   318篇
  1982年   322篇
  1981年   361篇
  1980年   312篇
  1979年   297篇
  1978年   276篇
  1977年   203篇
  1976年   200篇
  1975年   204篇
  1974年   153篇
  1973年   173篇
  1972年   127篇
  1971年   112篇
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
1.
We collected 469 frontal face images of Ukrainian cabinet ministers who were in office in 2000–2020. For each image, the minister's body mass index was estimated using a computer vision algorithm. The time series of median estimated body mass index of cabinet ministers co-moves over time with two existing measures of corruption – World Bank worldwide governance indicator Control of Corruption, and the discrepancy between the quantity of luxury wristwatches exported from Switzerland to Ukraine (reported by Swiss statistics) and the corresponding quantity imported by Ukraine from Switzerland (reported by Ukrainian statistics).  相似文献   
2.
This paper presents an approach to assessing the efficacy of public spending on research and development in state programs. At present, there is a need to develop a unified approach to the analysis and evaluation of the efficacy of such spending from the perspective of participants in state programs (federal executive bodies). The proposed approach does not allow evaluating the efficacy of public spending on the development of research areas assigned to the authors.  相似文献   
3.
4.
Without guaranteed compensation, granted by the German Renewable Energy Sources Act (Erneuerbare Energien Gesetz/EEG), biogas plants compete with all other plant types on the market for electrical energy. However, exchange-based electricity products do not currently permit an economically viable operation of biogas plants owing to their cost situation.  相似文献   
5.
6.
7.
This paper studies the expansion of an option price (with bounded Lipschitz payoff) in a stochastic volatility model including a local volatility component. The stochastic volatility is a square root process, which is widely used for modeling the behavior of the variance process (Heston model). The local volatility part is of general form, requiring only appropriate growth and boundedness assumptions. We rigorously establish tight error estimates of our expansions, using Malliavin calculus. The error analysis, which requires a careful treatment because of the lack of weak differentiability of the model, is interesting on its own. Moreover, in the particular case of call–put options, we also provide expansions of the Black–Scholes implied volatility that allow to obtain very simple formulas that are fast to compute compared to the Monte Carlo approach and maintain a very competitive accuracy.  相似文献   
8.
Prior literature examined reciprocity in the context of value creation. However, research has yet to examine whether reciprocity exists in value sharing. To address this gap, the authors examine retailer’s reciprocal value sharing with its manufacturer in relation to new product introductions. The authors test, via a survey of retail managers, whether reciprocal value sharing is influenced by an interaction of manufacturer’s prior new product success with innovativeness of a manufacturer’s products and the frequency of new product introduction. The results indicate that a retailer’s reciprocal value sharing is greater when the manufacturer historically launched successful new products, and that this effect is decreased with the innovativeness of a manufacturer’s products but increased with the frequency of new product introduction.  相似文献   
9.
10.
Firms increasingly use games to interact with their customers. Yet, surprisingly little is known about whether, when, and how such “gamified” interactions engage consumers with a firm’s brand, thereby facilitating self–brand connections. Building on flow theory, we show that gamified interactions that are highly interactive and optimally challenging facilitate self–brand connections, because such games lead to emotional and cognitive brand engagement. A field study and three experiments across various product domains and game designs support our theory. We also identify conditions under which consumers do not become engaged with a brand, namely when firms restrict their decisional control either to voluntarily participate in the game (i.e., compulsory play) or to spend as much time as desired playing the game (i.e., time pressure). Our findings advance existing knowledge about the use of games in marketing and provide important implications for how marketers can harness their potential to build self–brand connections.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号